Asledge hammer has a mass of 4.0 kg and is moving at a speed of 6.0m/s when it strikes a fence post, driving it 10 cm further into the ground. a) what was the kinetic energy of the sledge hammer? b) what is the average force exerted on the fence post by the hammer?

Part a)

kinetic energy of the hammer will be

here we know that

m = 4 kg

v = 6 m/s

now by the equation of kinetic energy we have

Part b)

for finding the force we will have

here we know that

now from above equation we have

now by Newton's II law we have

so it requires 720 N.

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